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Nanocellulose-Based Inks—Effect of Alginate Content on the Water Absorption of 3D Printed Constructs

1
Chemical Engineering Department, Faculty of Science, Universidad de Córdoba, Building Marie-Curie, Campus de Rabanales, 14014 Córdoba, Spain
2
RISE PFI, Høgskoleringen 6b, 7491 Trondheim, Norway
*
Author to whom correspondence should be addressed.
Bioengineering 2019, 6(3), 65; https://doi.org/10.3390/bioengineering6030065
Received: 27 May 2019 / Revised: 18 July 2019 / Accepted: 27 July 2019 / Published: 30 July 2019
(This article belongs to the Special Issue Biocomposite Inks for 3D Printing)
2,2,6,6-tetramethylpyperidine-1-oxyl (TEMPO) oxidized cellulose nanofibrils (CNF) were used as ink for three-dimensional (3D) printing of porous structures with potential as wound dressings. Alginate (10, 20, 30 and 40 wt%) was incorporated into the formulation to facilitate the ionic cross-linking with calcium chloride (CaCl2). The effect of two different concentrations of CaCl2 (50 and 100 mM) was studied. The 3D printed hydrogels were freeze-dried to produce aerogels which were tested for water absorption. Scanning Electronic Microscopy (SEM) pictures demonstrated that the higher the concentration of the cross-linker the higher the definition of the printed tracks. CNF-based aerogels showed a remarkable water absorption capability. Although the incorporation of alginate and the cross-linking with CaCl2 led to shrinkage of the 3D printed constructs, the approach yielded suitable porous structures for water and moisture absorption. It is concluded that the 3D printed biocomposite structures developed in this study have characteristics that are promising for wound dressings devices. View Full-Text
Keywords: nanocellulose; 3D printing; absorption; wound dressings nanocellulose; 3D printing; absorption; wound dressings
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MDPI and ACS Style

Espinosa, E.; Filgueira, D.; Rodríguez, A.; Chinga-Carrasco, G. Nanocellulose-Based Inks—Effect of Alginate Content on the Water Absorption of 3D Printed Constructs. Bioengineering 2019, 6, 65.

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